Langbahn Team – Weltmeisterschaft

Geostationary Satellite for Defense and Strategic Communications

SGDC
Mission typeEarth orbiter
OperatorTelebrás and Viasat
COSPAR ID2017-023B[1]
SATCAT no.42692[2]
WebsitePortal SGDC Telebras
Mission duration18 years (planned)
Spacecraft properties
Bus4000C4
ManufacturerThales Alenia Space
Launch mass5,735 kg (12,644 lb)
Dimensions7.10 m × 2.20 m × 2.0 m (23.3 ft × 7.2 ft × 6.6 ft)
Power11 kW
Start of mission
Launch dateMay 4, 2017, 21:52 (2017-05-04UTC21:52) UTC[3][4]
RocketAriane 5 VA236
Launch siteKourou ELA-3
ContractorArianespace
Orbital parameters
Reference systemGeocentric
RegimeGeostationary
Longitude73.7° W[2]
Semi-major axis42,164.0 km (26,199.5 mi)[2]
Eccentricity0.00016[2]
Perigee altitude35,784.6 km (22,235.5 mi)[2]
Apogee altitude35,802.6 km (22,246.7 mi)[2]
Inclination0.0229°[2]
Period1,436.1 minutes[2]
RAAN66.4545°[2]
Argument of perigee43.2613°[2]
Mean anomaly250.3095°[2]
Mean motion1.00272241[2]
EpochJuly 8, 2018[2]
Revolution no.436
Transponders
Band50 Ka band
7 IEEE X-band
Coverage areaBrazil, South Atlantic Ocean

The Geostationary Satellite for Defense and Strategic Communications (Portuguese: Satélite Geoestacionário de Defesa e Comunicações Estratégicas, or SGDC) is a Brazilian geostationary communication satellite that was built by Thales Alenia Space in France, it was placed in the orbital position of 75 degrees west longitude and will be operated by Telebrás. Telebrás selected Viasat as a partner to help build the associated ground system.[5] The satellite was based on the Spacebus-4000 platform and its life expectancy will be 18 years.[6]

The satellite was successfully launched into space on May 4, 2017, at 21:52 UTC, by means of an Ariane 5 vehicle from the French company Arianespace, launched from Guiana Space Centre, Kourou, French Guiana, together with the Koreasat 7.[7] It had a launch mass of 12,800 pounds (5,800 kg). The SGDC will be equipped with 50 Ka band transponders and 5 X band transponders to provide broadband internet and communications to the Brazilian government and the Brazilian Armed Forces.[8]

A backup satellite, SGDC-2, was initially planned for launch no earlier than 2022.[9] As of July 2021, the procurement of this satellite has been delayed indefinitely due to concerns over cost and the legality of the procurement agreement.[10][11]

See also

References

  1. ^ NASA, Goddard Space Flight Center (14 May 2017). "SGDC". NSSDC Master Catalog. Retrieved 14 May 2017.
  2. ^ a b c d e f g h i j k l m n2yo.com (July 8, 2018). "SGDC". Retrieved July 8, 2018.{{cite web}}: CS1 maint: numeric names: authors list (link)
  3. ^ Clark, Stephen (10 January 2017). "Launch schedule". Spaceflight Now. Retrieved 11 January 2017.
  4. ^ Gunter, Krebs. "SGDC 1". Retrieved May 4, 2017.
  5. ^ Viasat. "Telebras, Viasat Enter into Strategic Agreement to Connect the Unconnected in Brazil". Retrieved March 6, 2018.
  6. ^ Gunter, Kreb's. "SGDC 1". Gunter's Space Page. Retrieved December 7, 2016.
  7. ^ "Brasil lança satélite que permitirá acesso à banda larga em áreas remotas". G1, Brasília (in Portuguese). May 4, 2017. Retrieved May 4, 2017.
  8. ^ Satélite geoestacionário vai garantir a segurança das comunicações brasileiras. Archived 2016-12-20 at the Wayback Machine Telebrás (in Portuguese). Retrieved 2016-12-07.
  9. ^ Henry, Caleb (April 10, 2019). "Brazil to order second dual civil-military communications satellite". SpaceNews. Retrieved September 17, 2019.
  10. ^ OECD (October 26, 2020). "OECD Telecommunication and Broadcasting Review of Brazil 2020" (PDF). DevelopmentAid: 182. doi:10.1787/30ab8568-en. ISBN 978-92-64-31744-4. S2CID 243034008. Retrieved September 28, 2021.
  11. ^ "'What we're doing is an auction with an extremely low spectrum price'". BNamericas. July 24, 2021. Retrieved September 28, 2021. BNamericas: Will there be a new geostationary satellite? It was part of the initial SGDC program plan that Brazil had more than one geostationary satellite. Menezes: Yes, the initial idea was to have a constellation. But I think there's no space for this at the moment. We're not discussing it. But there are private options out there.


Quelle: https://en.wikipedia.org/wiki/SGDC